Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1990-12-31
1993-08-24
Coles, Sr., Edward L.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
385 3, H04B 1016
Patent
active
052394018
ABSTRACT:
Optical communication methods and apparatus are disclosed for transmitting two or more optical signals with different optical carrier frequencies on a single optical fiber with high spectral efficiency. Each optical carrier is typically modulated with multiple modulated subcarriers. In one embodiment, an optical phase modulator provides cancellation of second order intermodulation products in each optical signal, thereby permitting the optical carrier frequencies to be spaced by 2f.sub.max, where f.sub.max is the maximum modulation frequency. In another embodiment, a single sideband optical phase modulator provides cancellation of second order intermodulation products and one signal sideband, thereby permitting the optical carrier frequencies to be spaced by f.sub.max.
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Coles Sr. Edward L.
GTE Laboratories Incorporated
Monks Lawrence E.
Pascal L.
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